Abstract
This paper presents an image-based micromechanical modeling approach for simulating the damage-couple viscoelastic response of asphalt mixture. Details of the numerical damage-couple viscoelastic constitutive formulation implemented in a finite element code are presented and illustrated by using the ABAQUS user material subroutine (UMAT). Then, an experimental procedure based on the Linear Amplitude Sweep test for obtaining the viscoelastic and damage parameters at a given temperature was conducted. An improved morphological multi-scale algorithm was employed to segment the adhesive coarse aggregate images. We developed a pixel-based digital reconstruction model of asphalt mixture with the X-ray CT image after being processed. Finally, the image-based FE model incorporated with damage-coupled viscoelastic asphalt mastic phase and elastic aggregates was used for the compressive test simulations successfully in this study. Simulation results showed that the damaged simulation results have a larger stress distribution compared with the undamaged simulation due to the irregularity of the coarse aggregates. The von Mises stress distribution is smaller as the loading time increases due to the viscoelastic behavior of asphalt mastic. It can also provide insight on the damaged mechanisms and the possible location in asphalt mixture where microscopic cracking would most likely occur.
Highlights
Asphalt mixture is the most widely used road building material in the pavement industry.The mechanical behavior of the asphalt mixture is complex due to the heterogeneity of the asphalt composite material and the time- and temperature-dependent viscoelastic binder
In order to predict the micromechanical response of asphalt mixture at a constant temperature, very few damage models have been coupled to linear viscoelasticity and damage constitutive equations considering the discrete damage density for each incremental step
This paper presents an image-based micromechanical modeling approach for simulating the damage-couple viscoelastic response of asphalt mixture at a given temperature
Summary
Asphalt mixture is the most widely used road building material in the pavement industry. Zeng et al [30,31] proposed a two-phase microstructural numerical simulation framework to analyze damage behaviors of heterogeneous asphalt mixture under low temperature In this framework, the asphalt mastic damage is considered to be only relative to the deviatoric stress. In order to predict the micromechanical response of asphalt mixture at a constant temperature, very few damage models have been coupled to linear viscoelasticity and damage constitutive equations considering the discrete damage density for each incremental step. We propose a damage-coupled viscoelastic model based on the Linear Amplitude Sweep (LAS) test and implement the constitutive model in a finite element code using the ABAQUS user material subroutine (UMAT) In this constitutive model, the damage density is defined as a function of the current strain. The image-based numerical sample combined with the ABAQUS user material subroutine will be applied to predict the viscoelastic behavior of a real microstructure asphalt mixture specimen
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